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The lumbrical muscles comprise a set of 4 intrinsic hand muscles attached to the flexor digitorum profundus (FDP) tendons proximally and the digits' extensor expansions distally (see Image. Right Hand Lumbricals, Anterior View). These muscles are cylindrical and wormlike, resembling earthworms belonging to the genus Lumbricus. All 4 lumbricals flex the metacarpophalangeal (MCP) joints and extend the proximal interphalangeal (PIP) and distal interphalangeal (DIP) joints.[1] By coordinating with other hand muscles, the lumbricals help control the fine and delicate movements of the fingers. The actions of these muscles are essential for gripping objects, typing, and performing various dexterous hand movements. This is a review of the anatomy and clinical importance of the lumbricals.